Improvement in sewing-machines



2 sheets-sheet 1.

A. SHA-TTUCK.

Improvement in Sewing Machines. N0 124,167, PatentedFeb.27,1872.

zsh `--sh 2. SHATTUCK. ee e improvement in Sewing Mahines- Nn, 1MM?.

Patented Feb.27, 1872.

fw w NITED STATES ALVIN SHATTUOK, OF BUFFALO, NEW YORK.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 124,167, dated February 27, 1872.

To all uhom it may concern:

Be it known that I, ALVIN SHATTUCK, of Buffalo, in the county of Erie and State of N ew York, have invented a new and valuable Improvement in Sewin gMachines5 and I do hereby declare that the following is a full, clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawing making a part of this speciiication and to the letters and figures of reference marked thereon.

Figure l of drawing' is a representation of a central vertical longitudinal section ot' my invention. Fig 2 is a bottom view ofthe same.

This invention has relation to sewingma chines; and the novelty consists in the construction and arrangement of the devices hereinafter described, whereby the sewing-machine is adapted for interchangeable operation, in or der to produce either the lock or shuttle stitch or the double-loop stitch, as may be desired. This invention also consists in the construction and novel arrangement of mechanism for communicating from the rotary motor-shaft a reciprocating rectilinear motion to the shuttle and reciprocating rotary motion to the loophook, as hereinafter described. This invention furthermore consists in the construction and novel arrangement of a takeup device, 0peratin g in connection with the needle-bar, as and for the purpose hereinafter described.

In the accom pan yin g drawing, A represents the rotary motor-shaft of a sewing-machine, having its bearings at the ends of the fixed arm B. The needle-bar C plays through guides at the forward end of the arm B, and receives motion from the shaft A through the medium of a crank-wheel, D, and pitman D. To the motor-shaft, near its rear end, is secured a globe or collar, E, around which is cut an oblique groove, c, having parallel sides, the planes of which are in oblique relation to the axial center of the motor-shaft. In thisgroove are litted segments or blocks e or friction-rollers. These segments are pivoted to the arms of a yoke, G, attached to the upper end of a vertical shaft, H, having its bearing in the clothplate H. The object of the grooved globe is to communicate from the rotary motion of the motor-sh aft an alternating rotary motion to the shaft H. This object may obviously be accomplished by constructing the globe with a ridge in lieu of a groove, and substituting grooved for plane segments. The lower end ofthe shaft H is attached to a vibrating arm, I, which is connected to the shuttle-carrier J by means of a pivoted connecting-rod, J1. J 2designates the shuttle-race, which is pivoted at one end to the cloth-plate, and may be adjusted at its other end by means of a thumb-screw, 7c, which slides through a slot, k1, in said cloth-plate. The adjustin g-end of the shuttle-race projects through a space between the cloth-plate and a strip of metal, 7a2, which serves as a guide. From the forward side of the shuttle-race a bracket, L, projects and constitutes a bearing to a vertical shaft, L1, holding on its upper end the loophook L2. An arm, M, is attached to the lower end of the shaft L1. A pivoted rod, N, connects said arm to the vibrating bar I, and communicates to the shaft and loop-hook an alternating rotary motionthe motion required in the production of the loop-stitch. O designates the needle, secured to the lower'end of the needle-bar G, and working through a hole, p, in the cloth-plate.

To adapt the machine to make a lock-stitch, the shuttle-race is adjusted forward until it reaches a position that will allow the shuttle to catch the thread-loop from the needle, after which the forming of the stitches proceeds according to the usual method. During this operation the loop-hook is not available. In order to use the hook the shuttle-race is adjusted back, bringing the hook in a position to encircle the needle and grasp the thread. In the formation of Vthe lock-stitch the needle, in descendin g, passes through a channel in the wall of the race and through an aperture in the bottom part. While forming the loop-stitch the needle passes through an aperture in the bracket L. e

P designates a rod fitting loosely within the upper part of the needle-bar, where the latter is tubular. From one side of said rod, near its l lower end, a stud, P', projects, passing through a vertical slot in the needle-arm. B represents a spring, secured to the flange or head of the Xed arm B, and constructed with a triangular head, r. When the needle-bar is raised, the stud P forces back the spring by pressing A against the lower bevel of the head r, and rests on the top part of the head until, as the bar descends, the upper end of theslot, striking the stud. forces it down. The rod P has an eye, .19', in its head for the thread to pass through, and is employed as a take-up. The rod only falls after the needle has entered the fabric. Y

The segments e may sometimes be secured rigidly to the yoke G, in order to give a pendulum motion to the shaft H. In such cases the shaft H is to be jointed to the vibrating arm I.

I claim as my inventionl. The combination, with the hinged shuttlerace and its bracket L, of the looper and loopershaft, substantially as specified.

of" two witnesses. 1

ALVIN SHATTUOK. Witnesses:

J As. H. MILLS, ERNST GREIN. 

